An early 20th century American Emeralite desk lamp with a green to opaque white cased glass shade, raised on a single-arm brass support with original applied “EMERALITE DESK LAMP” plaque. The lamp rests on a square, embossed base with a beautifully aged patina. Adjustable shade. A timeless and functional lighting piece well suited to desks, libraries, and studies. Tested and in working order.